package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;
@Service
public class UserServiceImpl implements UserService {

    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";
//    appid=APPID&secret=SECRET&js_code=JSCODE&grant_type=authorization_code
    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;
    /**
     *微信登录
     */
    public User wxLogin(UserLoginDTO userLoginDTO) {

        String openid = getOpenId(userLoginDTO.getCode());
        if(openid == null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        //判断openid是否为空，为空登录失败
        User user = userMapper.getByOpenId(openid);

        //当前用户是否为新用户，自动完成注册
        if(user == null){
         user =  User.builder().openid(openid).createTime(LocalDateTime.now()).build();
            userMapper.insert(user);
        }

        return user;
    }

    /**
     * 调用微信接口服务来获取微信用户的openid
     */
        private String getOpenId(String code){
            //调用微信接口服务获取当前微信用户的openid
            Map<String,String> map = new HashMap<>();
            map.put("appid",weChatProperties.getAppid());
            map.put("secret",weChatProperties.getSecret());
            map.put("js_code",code);
            map.put("grant_type","authorization_code");
            String json = HttpClientUtil.doGet(WX_LOGIN, map);

            //JSON字符串转为JSON对象
            JSONObject jsonObject = JSON.parseObject(json);
            String openid = jsonObject.getString("openid");
            return openid;
        }
}
